CHAPTER XI 
CONSIDERATION OF BRITISH BIRDS 
In order to demonstrate, in still more detail, 
the applicability of the theory, it will now be 
applied to the colour of adult British Birds 
during the breeding season. This material 
is chosen because it is better to treat a small 
amount of material exhaustively, than to pick 
out from a large quantity (aves) only favour- 
able examples; and because the habits and 
colours of British Birds are very well and 
widely known : also because birds, as a whole, 
are thus by no means badly exemplified ; and 
birds well exemplify the theory. They are 
classified in the following way, and will be 
considered accordingly : 
Birds of prey. 
1. Male and female . Night birds. 
both cryptic . Song birds, 
. Other birds. 
2. Female attracting Open nests. 
Male attracting Closed nests. 
Open nests. 
3. Female cryptic 
Male attracting { . Closed nests, 
4, Female attracting { . Open nests (2 birds). 
Male cryptic 10. Closed nests (nil). 
SO DMD Om oo bo 
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